the earlier 620 subframe used different plastic and a larger airbox that accepts the larger 450-525 airfilter/cage but has no battery space... but dont ask me bout this

I dont think the plastics match up as the earlier one had a flat bar across the rear and the newer has one with a punched out gusset that rises higher to add a little suspension bottoming room. You can add some type of spacer on the older sub to fit a new style OEM rear fender. But there is many threads on this in the thumper section especially one by laramie about different colors that the LC4 wears.